Hydroxyethyl Cellulose (HEC)ndi ether yosungunuka m'madzi yopanda ionic cellulose, yomwe imagwiritsidwa ntchito kwambiri mu zokutira, zipangizo zomangira, mankhwala, mankhwala a tsiku ndi tsiku ndi zina. Komabe, HEC ili ndi kusungunuka kwamadzi ambiri komanso kufooka kwa hydrophobicity, zomwe zingayambitse zolepheretsa magwiridwe antchito nthawi zina. Chifukwa chake, hydroxyethyl cellulose yosinthidwa hydrophobically (HMHEC) idapangidwa kuti ikonze mphamvu zake za rheological, kukhuthala, kukhazikika kwa emulsification komanso kukana madzi.
1. Kufunika kwa kusintha kwa hydroxyethyl cellulose komwe kumakhudza hydroxyethyl cellulose
Kupititsa patsogolo mphamvu zokhuthala ndi mphamvu za rheological
Kusintha kwa hydrophobic kumatha kusintha kwambiri mphamvu ya HEC yokhuthala, makamaka pamlingo wotsika wodula. Kumaonetsa kukhuthala kwakukulu, komwe kumathandiza kukonza thixotropy ndi pseudoplasticity ya dongosololi. Kapangidwe kameneka ndi kofunikira kwambiri m'magawo a zokutira, madzi obowola mafuta, zinthu zosamalira thupi, ndi zina zotero, ndipo kumatha kukulitsa kukhazikika ndi kugwiritsa ntchito kwa chinthucho.
Sinthani kukhazikika kwa emulsion
Popeza HEC yosinthidwayo imatha kupanga kapangidwe kogwirizana mu yankho lamadzi, imawongolera kwambiri kukhazikika kwa emulsion, imachepetsa kulekanitsidwa kwa mafuta ndi madzi, ndikuwonjezera mphamvu ya emulsification. Chifukwa chake, imagwiritsidwa ntchito kwambiri m'magawo a zokutira za emulsion, zinthu zosamalira khungu ndi zosakaniza chakudya.
Kulimbitsa kukana madzi ndi kupanga mafilimu
HEC yachikhalidwe ndi yofewa kwambiri ndi madzi ndipo imasungunuka mosavuta m'malo okhala ndi chinyezi chambiri kapena m'madzi, zomwe zimakhudza kukana kwa madzi kwa zinthuzo. Kudzera mu kusintha kwa hydrophobic, kugwiritsidwa ntchito kwake mu zokutira, zomatira, kupanga mapepala ndi zina kumatha kukulitsidwa, ndipo kukana kwake madzi ndi mawonekedwe ake opanga filimu kumatha kukulitsidwa.
Sinthani mphamvu zochepetsera kumeta tsitsi
HEC yosinthidwa ndi hydrophobic imatha kuchepetsa kukhuthala pansi pa mikhalidwe yodula kwambiri, pomwe imasunga kusinthasintha kwakukulu pamlingo wotsika wodula, motero imawongolera magwiridwe antchito omanga ndikuchepetsa kugwiritsa ntchito mphamvu. Ili ndi phindu lofunikira m'mafakitale monga migodi yamafuta ndi zokutira zomangamanga.
2. Kusintha kwa hydroxyethyl cellulose komwe sikungachitike ndi madzi
Kusintha kwa HEC hydrophobic nthawi zambiri kumachitika mwa kuyambitsa magulu a hydrophobic kuti asinthe kusungunuka kwake ndi kukhuthala kwake kudzera mu kulumikiza mankhwala kapena kusintha kwa thupi. Njira zodziwika bwino zosinthira hydrophobic ndi izi:
Kulumikiza gulu la hydrophobic
Kuyambitsa alkyl (monga hexadecyl), aryl (monga phenyl), siloxane kapena magulu a fluorinated pa molekyulu ya HEC kudzera mu reaction ya mankhwala kuti ikonze hydrophobicity yake. Mwachitsanzo:
Kugwiritsa ntchito esterification kapena etherification reaction ku graft long-chain alkyl, monga hexadecyl kapena octyl, kuti apange hydrophobic animation structure.
Kuyambitsa magulu a silicone kudzera mu kusintha kwa siloxane kuti iwonjezere kukana kwake madzi ndi mafuta.
Kugwiritsa ntchito kusintha kwa fluorination kuti kukhale kolimba komanso kopanda fungo la madzi, zomwe zimapangitsa kuti ikhale yoyenera kugwiritsa ntchito zokutira zapamwamba kapena ntchito zapadera zachilengedwe.
Kusintha kwa Copolymerization kapena cross-linking
Mwa kuyambitsa ma comonomers (monga ma acrylates) kapena ma cross-linking agents (monga ma epoxy resins) kuti apange netiweki yolumikizirana, mphamvu ya HEC yolimbana ndi madzi ndi kukhuthala imakula. Mwachitsanzo, kugwiritsa ntchito HEC yosinthidwa ndi hydrophobically mu ma polymer emulsions kungathandize kukhazikika ndi kukhuthala kwa emulsion.
Kusintha kwa thupi
Pogwiritsa ntchito ukadaulo wothira madzi pamwamba kapena ukadaulo wothira madzi, mamolekyulu othira madzi amapakidwa pamwamba pa HEC kuti apange hydrophobicity inayake. Njirayi ndi yofatsa ndipo ndi yoyenera kugwiritsidwa ntchito ndi zofunikira kwambiri kuti mankhwala azikhala olimba, monga chakudya ndi mankhwala.
Kusintha kwa mgwirizano wa hydrophobic
Mwa kuyambitsa magulu ochepa a hydrophobic pa molekyulu ya HEC, imapanga associative aggregate mu yankho lamadzi, motero imakulitsa luso lokhuthala. Njirayi imagwiritsidwa ntchito kwambiri popanga zokhuthala zapamwamba ndipo ndi yoyenera zophimba, mankhwala amafuta ndi madera ena.
Kusintha kwa Hydrophobic kwahydroxyethyl celluloseNdi njira yofunika kwambiri yowonjezerera magwiridwe antchito ake, zomwe zingawonjezere mphamvu yake yokhuthala, kukhazikika kwa emulsification, kukana madzi ndi mphamvu za rheological. Njira zodziwika bwino zosinthira zimaphatikizapo hydrophobic group grafting, copolymerization kapena cross-linking modification, physical modification ndi hydrophobic association modification. Kusankha bwino njira zosinthira kungathandize kuti HEC igwire bwino ntchito malinga ndi zofunikira zosiyanasiyana zogwiritsira ntchito, kuti ikhale ndi gawo lalikulu m'magawo ambiri monga zophimba zomangamanga, mankhwala amafuta, chisamaliro chaumwini, ndi mankhwala.
Nthawi yotumizira: Marichi-25-2025